Collapsible arch or center.



PATENTED' DEC. 31, 1907.

C. W. MCDONALD.

' UOLLAPSIBLB ARCH OR CENTER.

APPLICATION HLED MAR. 21. 1907.

Witnesses UNITED- STATES P i iii-Iii [inns 1w. Manon/ iler o'oLnaPsmna m an N0.875,551. Specincation of ilettfe'rs at t.

- i 1 Application filed March 21.1907. aeti1 i mj.

T (Lil whom it may concern; to lots in t Be it known that I, (hr/nuns NV. MoDore constructed. .II-lQlLL- wil-l. th s e, pgder- ALD, a citizen. of the United States, residing stood that each mold will .l.- e.provi d (1 tone at New York, in the countyoliNew York and sidewith couplinwilangesand. at thenpposite .60 5 State of New York," have invented new and side with a set oi? staples for. respective conuseiul Improvements in Collapsible Arches nection. withthe-staples and flanges of cooporCenters, ofwliich the following is a spccilieratingmolds. Pins or keys, or other fastencation. a ing devices, may be passed through the sta- This invention relates toimprovements in ples ivhen they are in coupling engagement 10 Inolds or centerings especiallydesigned for with theilanges otan adjacentimold, tohold. use in the constructionoi 'ai'cl-ies and the like the parts in looking engagement. of concrete, artificial stone, etc., the object Secured-to the. inner facaofeacl moldsecof theinvention being to-providc a sectional' tion adjacen t..,i.t s'lo,wer edge iS.&,., 1- )1 1git1}d nal mold which "may beeonveniently' folded or reinforcing strip ,9. upon ,tl'ie ends of whichre .15 collapsed for storage or transportation and --arearra ng d angl ;l iracl et's 10. To the-anadjusted to form surfaces varying in contour, gle brackets;v oi thc two mold sections are and in which provision is made for readily hingedly or pivotallyconnected arms ll apd connecting a plurality of molds to form an 12. As shown, each arm 11 is pivoted at its arch or other structure of any desired length. outer end to the angle bracket section 2 and 2c The preferred forni 'iif the invention is is pivotally connected at its inner end, as inillustrated in the accompanying drawing, in dicated at 13, to the inner end of the arm 12, which: which is-in turn pivotally connected at its Figure 1 is a perspective view ol" the mold outer end to an angle bracket .01] the section or centering as set up for use. Fig. l is an 3. The. hinge 13 comprises a pin or pintle 25 elevation of the samein partly collapsed conpassing through knuckles 14 and 15 formed dition. Fig. 3 is a detail, Sl'IUWiIIg the mode on the arms, which knuckles have curved (.f pivotally mounting the bracing arms. contact surfaces to permit the arms to swing Referring to the drawing, the numeral 1 inward. to adapt the mold to freely collapse designates the mold as a whole, which coinand are provided with contact shoulders 16 30 prises a pair of sections 2 and 3, of segmental and [7 adapted to abut when the arms are shape or proper form to form an arch or siniispread out to their fullest extent inlongitular structure of the desired curvature. dinal alinement to hold the arms rigidly The meeting or approximating edges of the braced when the mold sections are in operamold sections at the crowl'i ol" the mold are tive position.

85 united at suitable intervals by hinges or piv- One of the arms of each section, as the arm ois 4, thus adapting the free bottom edges of 11, is composed of two sections adjustably the section to swing toward or from each united to enable the arm to be adjusted as to other in collapsing the mold for storage. or length to compensate for expansion and contransportation or extending the san'ie for use. traction, or to adjust the. parts so that a proper 40 Tl esections are each provided at one ol their length of the arms will be insured to adapt side edges with. a projecting strip 5 riveted the abutting shoulders 16 and. 17 to come in thereto or formed integral therewith, as decontact when the arms 11 and 12 are outsired, and providing a coupling flange for enspread to their fullest extent and lie in longigagenient with the reverse edges of the sectudimil alinement in a true horizontal plane. 45 t'iors'of an adjacent mold, where-b a series in the present instancethe adjustable conof riolds of the character described may be iieclioii consists of a right and left threaded coupled together. The flanges 5 have their stem or coupling section lS'engaging corre- .outer surfaces-lying flush with the inner surspoddingly threaded sockets in the sections faces of the sections 2 and 3, so that the adf ol" the arm 11 and provided with an angular 50 j'acent sections of another mold may overlap head 1%) for the application of a wrench or said flanges and lie flush and in direct abutother suitable tool to conveniently effect the" ting contaet with said'sections. The hinges adjustment.

are formed with slots 7 to receive staples or The mode of use of the device will be read other coupling devices onthe other mold, l ily understood'by those conversant with de- 55 and the sections and 3 are provided al their vlces" of thls character, and 1t Wlll be seen that side edges opposite the flanges 5 with staples the construction is such as to provide a mold which when opened will be staunch and rigid and is adapted to be collapsed in close compass to permit of its convenient storage and transportation. The pivotal connection of a .the arms 11 and 12 also permits the mold to be folded to a greater or less extent to vary the contour of the forming surface or the she e of the mold as a whole, thus providing for tiie ready formation of arches or structures var ing from a true semicircular form. The mo d sections may be made of sheet metal or any other suitable material.

Having thus described the invention, what is claimed as new, is

- 1. An arehmold comprising sections hingedly united at their up -r edges, braekets upon the lower edges 0 the sections, inextensihle arms pivotally connected to 'the brackets of one section, extensible arms piv otally connected to the brackets of the other section, said sets of arms being pivotally connected with each other for an inward collapsing movement and for toggle-extension, each of said extensihlearms comprising sections and an adjusting screw connecting said sections, and stops upon the pivotally-connected ends of the sets of arms to abut and limit their toggleextension.

2v An arch-mold comprisingpartially circular seetiims hinged or lvoted at their meeting edges, each section eing provided at .one side with inwardly projecting staples and at the other side with slotted coupling flanges adapted for engagement with, corresponding staples on another mold, and folding braces pivotally connecting the lower edges of the section 3. A mold comprising segmental sections pivotally connected at their meeting edges, lnextensible arms pivotally connected with the free edge of one section, extensible arms pivotally connected with the free edge of the other section, said arms being pivotaily connected with each other for an inward collapsing movement and for toggle-extension, each of said ad ustable arms comprising spaced sections having threaded sockets, and a re versely threaded section engaging said sockets and adjustabl connecting said sections.

In testimony w iereof, I afiix my signature in presence of two witnesses.

CHARLES W. MEJDONA'LD.

Witnesses PmLIP J. BARRY, DUNCAN A. MACDONALD. 

